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~(131)I在国防工业、医学及科研领域有着广泛应用。由于它的衰变网图较复杂,半衰期较短且易于挥发,尤其是在溶液和膜源中微量~(131m)Xe的存在,使得~(131)I活度的精确测量具有一定的难度。我们采取分离~(131)I或开瓶制样后尽快测量,在膜源中加入微量AgNO_3溶液抑制~(131)I的挥发,测量时再在活斑上盖金膜等措施,从而提高了测量的精确性。同时找出直接测量和符合吸收法测量的活度值之差,可使~(131)I活度大为简化。一、原理 4πβ-γ符合法测量放射性核素活度的原理及装置已有文章报导。这里仅简单介绍~(131)I活度测量的基本原理。
~ (131) I in the defense industry, medicine and scientific research has a wide range of applications. Due to its complex decay network, short half-life and easy volatility, especially the presence of trace 131m Xe in solution and membrane source, it is difficult to accurately measure the activity of 131I. We take the separation of ~ (131) I or open bottle as soon as possible after the sample preparation, adding a trace amount of AgNO_3 solution in the film source to inhibit the volatilization of ~ (131) I, measurement and then cover the gold spot on the live plaque and other measures to improve Accuracy of measurement. At the same time to find the difference between the direct measurement and the activity value measured by the absorption method, the activity of ~ (131) I can be greatly simplified. First, the principle 4πβ-γ coincidence method of measuring radionuclide activity principle and device has been reported in the article. Here only a brief introduction to ~ (131) I activity measurement of the basic principles.